mmtimer: Remove the SGI SN2 mmtimer driver
This driver supports direct system clock access on the ancient SGI SN2 IA64 systems, and implement the only non-builtin k_clock instance. Remove it as any remaining IA64 altix user will be running just as old distros anyway. Dimitri Sivanich stated: "Since this is SN2 specific, this can be removed." Note that this does not affect the never uv_mmtimer driver for x86-based Altix systems. [ tglx: Added comment to CLOCK_SGI_CYCLE ] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Travis <mike.travis@hpe.com> Cc: Dimitri Sivanich <sivanich@hpe.com> Link: http://lkml.kernel.org/r/20170526090311.3377-2-hch@lst.de
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